Two vehicles, semi-similarly equipped (from a form factor and wind resistance perspective).
'22 ram diesel 3500 w/ 4WC Grandby (8' model), 2" thuren lift, 37s, 3.73, sitting around 12k averaging in the high 12 to low 14mpg, mid 11 when also flat towing a 100 series.
'22 (I think) Ford 7.3L...